It was reported that Chadwick was performing overhead activity for the roof installation in proximity with the ongoing excavation work by APM HH contractor without the required coordination and communication near GH20 today.   They were found to be working outside the established exclusion zone area. This portend  risk of machine/ human interface as well as falling object.  ACTION:  1. TCAJV/ Chadwick must ensure they coordinate with other contractors by ensuring they work within the agreed and established work zone.  2. Adequate supervision must be maintained by TCAJV/Chadwick.
Hazard category: Vehicle use and movement